Ensure that the extension icons show up in the omnibox at fractional scales.

ui/gfx/image/image_skia.h

Index: ui/gfx/image/image_skia.h
diff --git a/ui/gfx/image/image_skia.h b/ui/gfx/image/image_skia.h
index fa5d070ad9bdc31e17f10371dfb9d4c2dd7bb052..8e800faee34a20f51a4db4edfd7917c4c67e500b 100644
--- a/ui/gfx/image/image_skia.h
+++ b/ui/gfx/image/image_skia.h
@@ -78,6 +78,10 @@ class GFX_EXPORT ImageSkia {
   // density display.
   static ImageSkia CreateFrom1xBitmap(const SkBitmap& bitmap);
 
+  // Returns true if the scale passed in is the list of supported scales for
+  // the platform.
+  static bool IsSupportedScale(float scale);
+
   // Returns a deep copy of this ImageSkia which has its own storage with
   // the ImageSkiaRep instances that this ImageSkia currently has.
   // This can be safely passed to and manipulated by another thread.